EE & FOREMAN WERE SITTING @ FEEDER DISCUSSING WHAT NEEDED TO BE DONE DURING SHIFT. #2 CAR PULLED ONTO THE FEEDER WHILE THEY WERE TALKING. EE GOT UP, WALKED PAST #2 CAR- OPPOSITE THE OPERATOR- GOING TOWARD HIS MANTRIP. #2 CAR PULLED OFF FEEDER & WAS MAKING A LEFT TURN WHEN THE BOOM OF THE CAR STRUCK EE KNOCKING HIM TO THE BOTTOM. SHUTTLE CAR OPERATOR DID NOT KNOW HE WAS THERE.